中文摘要：

以PbF2为氟源,采用半化学法成功制备了钙钛矿相的F取代PMN-PT陶瓷。随F含量增加,陶瓷的体积密度增大。与含F试样相比,无F试样的晶粒较大,约10μm,介电常数峰和介电损耗峰都很尖锐,而且峰值介电常数异常高,约45000,其电滞回线矩形度高,剩余极化强度高,约30μC/cm^2,其压电常数较高,约420 pC/N;但在含F试样中,含摩尔分数2%F试样具有较好的显微结构、介电和压电性能。其晶粒约2～3μm,峰值介电常数约30000,剩余极化强度接近30μC/cm^2,压电常数约380 pC/N。

英文摘要：

The fluorine substituted PMN-PT ceramics with pure perovskite phase were prepared by semichemical method,and the fluorine came from the raw material PbF2.The density of these ceramics increased with the increase of fluorine contents.For the pure PMN-PT ceramic,the grain size is larger,approximately 10 μm,and the peaks of dielectric constants and dielectric loss are sharper,and the peak value of dielectric constant is abnormally high,about 45000,and the P-E hysteresis loop is more rectangular,and the remnant polarization is about 30 μC/cm^2,and the piezoelectric constant is about 420 pC/N.However,in the samples contained fluorine,the sample with 2 % mole fraction of F has better microstructure and dielectric and piezoelectric properties.The grains size is about 2-3 μm, and the peak value of dielectric constants is about 30000,and the remnant polarization is about 30 μC/cm^2,and the piezoelectric constant is about 380 pC/N.